date_combo_validate in core/modules/date/date.elements.inc

Validate and update a combo element.

date_limit_format in core/includes/date.inc

Limits a date format to include only elements from a given granularity array.

date_parts_element in core/modules/date/date.elements.inc

Creates form elements for one or more date parts.

date_popup_element_value_callback in core/modules/date/date.elements.inc

Element value callback for date_popup element.

date_popup_input_date in core/modules/date/date.elements.inc

Helper function for extracting a date value out of user input.

theme_date_display_combination in core/modules/date/date.theme.inc

Returns HTML for a date element formatted as a Start/End combination.

_date_popup_process_time_part in core/modules/date/date.elements.inc

Process the time portion of the element.